PLEASE PLEASE HELP!

the number of grams of H2 in 1620 mL of H2 gas.

calculate at STP

The number of grams of in 1620 mL is 1.44 g

Explanation:

According to ideal gas equation:

P = pressure of gas = 1 atm (at STP)

V = Volume of gas = 1620 ml = 1.62 L  (1L=1000ml)

n = number of moles = ?

R = gas constant =

T =temperature =

Mass of hydrogen =

The number of grams of in 1620 mL is 1.44 g

the answer is c) gamma rays

hope i : )

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.